Renal VeinsCollateral CirculationVeinsVena Cava, InferiorCollateral LigamentsRenal Nutcracker SyndromePortal VeinSaphenous VeinFlank PainVaricoceleMedial Collateral Ligament, KneePhlebographyRenal ArteryVaricose VeinsMesenteric VeinsSplenic VeinHematuriaConstriction, PathologicFemoral VeinAzygos VeinAnatomy, RegionalPulmonary VeinsIliac VeinVenous ThrombosisJugular VeinsNeoplasms, Vascular TissueKidneyLigationRenal Artery ObstructionNephrectomyAnastomosis, SurgicalHypertension, RenovascularTomography, X-Ray ComputedUmbilical VeinsAngiographyReplantationHepatic VeinsVascular Surgical ProceduresHypertension, RenalPopliteal VeinAorta, AbdominalArteriovenous FistulaLeiomyosarcomaVascular NeoplasmsResins, PlantNephrotic SyndromeUltrasonography, Doppler, ColorCadaver